Rashi on Judges
Oppressed the Bnei Yisroel intensely. R' Tanchuma expounded, through ridicule. Similarly, it is said, "Your remarks offend me intensely."2Malachi, 3:13. Vs. 14, 15 there define the offensive remarks as ridicule of the worship of Adonoy.
Metzudat David on Judges
it was because of the nine hundred chariots that they did not have the feeling of approaching them in battle stirring in their hears. they therefore cried out to Hashem in prayer